Probably not going to happen. There was a team of homebrewers working on a Smash Bros. DS a couple years ago until they were sent a Cease and Desist from Nintendo (as I recall, anyway). But yes, it would be very cool; we still have Jump Superstars though (the closest thing to Smash Bros. on the DS).

The DS could handle a n64 remake of the game... It could do that easily, plus add wi-fi! It really could... but when you think about it, do u really want to play the 64 version? It stinks! I mean, last time I played it I sucked badly cuz everything just feels weird... No if Nintendo makes a new DS, one that could do graphics/capability that as much as lets say the GCN... Then a new smash would be a fantastic idea.

but anyway, like blargos said, yea, its not like it would be BRAWL DS, it would just be a DS version of smash bros. and as sated earlier, if u can do asassin's creed on the DS then you can do a smash bros. ninja gaiden and call of duty 4 are on the DS as well, so they can surely do a Smash Bros. Theres also been a One piece game announced for the DS that is JUST like smash bros, the percentages, flying off the stage, everything. i forgot wat the game was called.